US3867873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag forming machines
Assignee: Spacials Ltd
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Filing: 1973-10-29
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Granted: 1975-02-25
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Expires: 1993-10-29
Abstract
Abstract The specification discloses apparatus for forming individual heat sealed articles, e.g., tubes or bags, from a strip of two superimposed layers of heat sealable material or of a material coated, or impregnated, with a heat sealable material which apparatus comprises means to feed the strip in a zig-zag configuration and means for welding together the layers of the strip at or adjacent the transverse crests of the strip located on one side of the zig-zag. The welding means comprise a single continuous welding device and the feed means includes means for supporting the strip at the transverse crests located on the mentioned one side of the zig-zag and for presenting those crests to the welding device.
Inventors
- 👤 Arthur William Simpson
- 👤 Frank William Pocock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:26
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/02; B31B70/022; B31B70/024; B31B2155/00; B31B2160/00; B31B2160/10; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
Apparatus for forming individual heat sealed articles, e.g. tubes or bags, from a strip of two superimposed layers of heat sealable material or of a material coated, or impregnated, with heat sealable material, said apparatus comprising: a welding device comprising a continuous surface of heat transmitting material; means to heat said surface; and means for feeding a strip of material in a zig-zag configuration along a path which extends along at least a part of said continuous surface, said feeding means comprising members supporting said strip at the transverse crests located on both sides of the zig-zag to present the crests on one side of said zig-zag to said continuous surface.
Claim 2
Dependent Claim
111 words
Apparatus for forming individual heat sealed articles, e.g. tubes or bags, from a strip of two superimposed layers of heat sealable material or of a material coated, or impregnated, with heat sealable material, said apparatus comprising: a welding device comprising a continuous surface of heat transmitting material; means to heat said surface; and means for feeding a strip of material in a zig-zag configuration along a path which extends along at least a part of said continuous surface, said feeding means comprising members supporting said strip at the transverse crests located on both sides of the zig-zag to present the crests on one side of said zig-zag to said continuous surface.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in claim 1, wherein said continuous surface is cylindrical and is mounted for rotation when engaged by the moving strip.
Claim 4
Dependent Claim
192 words
In apparatus for forming individual heat sealed articles, e.g., tubes or bags, from a strip of two superimposed layers of heat sealable material or of a material coated, or impregnated with heat sealable material, which apparatus comprises means to feed the strip in a zig-zag configuration and means for welding together the layers of said strip at or adjacent the transverse crests of said strip located on one side of the zig-zag, the improvement wherein: said welding means comprises a cylindrical surface of heat transmitting material mounted for rotation, when engaged by the moving strip, on an eccentric portion of a shaft which is itself rotatably mounted on a support structure to move the cylindrical surface towards or away from the zig-zag strip, and means for heating said cylindrical surface; and said feed means comprises means for supporting said strip at the transverse crests located on both sides of the zig-zag and for pressing said crests on said one side of said strip against said cylindrical surface, so that by moving the cylindrical surface towards or away from said zig-zag strip the width of the finished heat sealed articles can be altered.
Claim 5
Dependent Claim
192 words
In apparatus for forming individual heat sealed articles, e.g., tubes or bags, from a strip of two superimposed layers of heat sealable material or of a material coated, or impregnated with heat sealable material, which apparatus comprises means to feed the strip in a zig-zag configuration and means for welding together the layers of said strip at or adjacent the transverse crests of said strip located on one side of the zig-zag, the improvement wherein: said welding means comprises a cylindrical surface of heat transmitting material mounted for rotation, when engaged by the moving strip, on an eccentric portion of a shaft which is itself rotatably mounted on a support structure to move the cylindrical surface towards or away from the zig-zag strip, and means for heating said cylindrical surface; and said feed means comprises means for supporting said strip at the transverse crests located on both sides of the zig-zag and for pressing said crests on said one side of said strip against said cylindrical surface, so that by moving the cylindrical surface towards or away from said zig-zag strip the width of the finished heat sealed articles can be altered.
Claim 6
Dependent Claim
25 words
Apparatus as claimed in claim 3, wherein said means for heating said cylindrical surface comprises a plurality of heating elements mounted with said cylindrical surface.
Claim 7
Dependent Claim
17 words
Apparatus as claimed in claim 4, wherein said heating elements are secured with respect to said shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |